code: def tree_flatten(self):
      return self._values, self._keys
  
imports: from __future__ import annotations
  from collections.abc import Hashable
  import dataclasses
  import inspect
  import threading
  from typing import Any, Protocol
  import jax
  from jax import tree_util
  from jax._src import core
  from jax._src import debugging
  from jax._src import traceback_util
  from jax._src import util
label_desc: Use image node_id 3 for calling the _DictWrapper obj's underlying member method code with example usage: obj.tree_flatten() and returns: self,  self